在弥赛尼盐度危机期间跟踪石质层分层和表面过程
Frédéric Mouthereau1,2, Louise Boschetti3,4, Marine Larrey3,5
1GET, Université de Toulouse, UPS, CNRS, IRD, Toulouse, France. frederic.mouthereau@get.omp.eu.
Nature communications
|May 9, 2025
概括
西地中海的石层分层在弥赛尼盐危机 (MSC) 之前发生. 新的约会揭示了这一事件触发了扩展和提升,导致MSC.
科学领域:
- 地质地质地质地质地质地
- 构造学 构造学 构造学 构造学
- 地质时间学 (Geochronology)
背景情况:
- 石层分层与表面提升,岩化和延伸有关.
- 据推测,分层是西地中海发生梅西尼盐危机 (MSC) 之前引发的升起.
- 之前的研究缺乏时间分辨率来确认分层是MSC升起的主要原因.
研究的目的:
- 调查石质层分层的时间和机制及其与梅西尼亚盐分危机的联系.
- 解决东贝蒂克内山盆地分层,延伸和提升之间的时间关系.
- 了解板块脱离在区域构造进化的作用.
主要方法:
- 石灰岩静脉的U-Pb地质年代学.
- 石静脉的聚合同位素热度计.
- 盆地演变的结构分析.
主要成果:
- 8.5-5万年前发生了一次短暂的流体事件,与延伸和收缩分层有关.
- 缩短和提升开始于后来,从4.5到3万年前,在非洲-伊比利亚板块边界.
- 弥赛尼盐度危机发生在缩短阶段之前,并在分层过程中发生.
结论:
- 分层开始扩展和提升,引发了梅西尼亚盐水危机.
- 大约5亿年前的碎片分离导致了MSC的结束,形成了一个新的板块边界断层,以及构造逃逸.
- 这项研究提供了高分辨率的日期,以澄清分层与梅西尼盐分危机之间的因果关系.
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